APWA works with many organizations and groups.  You can learn more about these organizations below.

American Academy of Environmental Engineers & Scientists (AAEES)
The American Academy of Environmental Engineers & Scientists  is a non-profit 501(c)(6) organization serving the Environmental Engineering and Environmental Science professions.  AAEES is dedicated to improving the practice, elevating the standards, and advancing public recognition of environmental engineering through a program of specialty certification of qualified engineers and scientists.  AAEES promotes excellence in the practice of environmental engineering to ensure the public health, safety, and welfare.
American Association of State Highway & Transportation Officials (AASHTO)
AASHTO is a nonprofit, nonpartisan association representing highway and transportation departments in the 50 states, the District of Columbia, and Puerto Rico. It represents all five transportation modes: air, highways, public transportation, rail, and water. Its primary goal is to foster the development, operation, and maintenance of an integrated national transportation system.
American Council of Engineering Companies
The American Council of Engineering Companies (ACEC) is the voice of America's engineering industry. Council members – numbering more than 5,000 firms representing more than 500,000 employees throughout the country – are engaged in a wide range of engineering works that propel the nation's economy, and enhance and safeguard America's quality of life. The Council's mission is to contribute to America's prosperity and welfare by advancing the business interests of member firms.
American Institute of Architects
The American Institute of Architects (AIA) is the leading professional membership association for licensed architects, emerging professionals, and allied partners.  The AIA has nearly 300 state and local chapters that serve as the voice of the architecture profession and the resource for their members through advocacy, information, and community. 
American Planning Association
The American Planning Association (APA) is a nonprofit education and membership organization. Members include practicing planners, planning students, elected and appointed officials, planning commissioners, and interested citizens. The American Planning Association and its professional institute, the American Institute of Certified Planners, are dedicated to advancing the art, science and profession of good planning — physical, economic and social — to create communities that offer better choices for where and how people work and live.
American Society of Civil Engineers
The American Society of Civil Engineers (ASCE) represents more than 140,000 members of the civil engineering profession worldwide and is America's oldest national engineering society.  ASCE advances civil engineering and serves the public good through advancing technology, encouraging lifelong learning, developing civil engineer leaders, and advocating infrastructure and environmental stewardship.
American Society of Landscape Architects
The American Society of Landscape Architects (ASLA) is the national professional association for landscape architects, representing 17,000 members in 48 professional chapters and 68 student chapters. The Society's mission is to lead, to educate, and to participate in the careful stewardship, wise planning, and artful design of our cultural and natural environments. 
The Center for Climate and Energy Solutions–C2ES 
C2ES is an independent, nonpartisan, nonprofit organization working to advance strong policy and action to address the twin challenges of energy and climate change.  Launched in November 2011, C2ES is the successor to the Pew Center on Global Climate Change, long recognized in the United States and abroad as an influential and pragmatic voice on climate issues. The Pew Center’s founder, Eileen Claussen, and its senior team continue to lead the effort.  C2ES believes that ensuring safe, reliable, affordable energy for all – while protecting the global climate – is a paramount challenge of the 21st century.
Engineers Joint Contract Documents Committee (EJCDC)
The Engineers Joint Contract Documents Committee (EJCDC) is a joint venture of four major organizations of professional engineers and contractors. Since 1975, EJCDC has developed and updated fair and objective standard documents that represent the latest and best thinking in contractual relations between all parties involved in engineering design and construction projects.
Greenroads Foundation
Greenroads is a sustainability rating system for roadway design and construction. It is applicable to all roadway projects. Greenroads is a collection of sustainability best practices, called "credits," that relate to roadway design and construction. Achieving these credits can earn points toward a total score for the project, and in general, this Greenroads™ score can be used as an indicator of sustainability for the roadway. Four different certification levels (ratings) are available depending upon total score on a voluntary basis.
International City/County Management Association
The International City/County Management Association, advances professional local government worldwide. Its mission and vision is to create excellence in local governance by developing and fostering professional management to build sustainable communities that improve people’s lives worldwide. ICMA provides member support; publications; data and information; peer and results-oriented assistance; and training and professional development to nearly 9,000 city, town, and county experts and other individuals and organizations throughout the world.  The management decisions made by ICMA's members affect millions of individuals living in thousands of communities, from small villages and towns to large metropolitan areas.
ICLEI - Local Governments for Sustainability USA (International Council for Local Environmental Initiatives)
ICLEI is the leading nonprofit membership association devoted to local governments engaged in sustainability, climate protection, and clean energy initiatives.  In the United States, ICLEI USA is the recognized leader in its field, creating cutting-edge tools and establishing national standards.  For example, ICLEI's Sustainability Planning Toolkit, based on the model pioneered by City of New York's PlaNYC, contains comprehensive, step-by-step guidance to develop a sustainability plan for cities, towns, and counties of all sizes. It follows a proven, straightforward, and flexible process to create a successful, long-term plan that brings together environmental, economic, and social initiatives under one holistic vision to improve the livability of communities and create lasting benefits. 
National Association of Counties (NACo)
The National Association of Counties (NACo) is the only national organization that represents county governments in the United States. Founded in 1935, NACo provides essential services to the nation’s 3,068 counties. NACo advances issues with a unified voice before the federal government, improves the public’s understanding of county government, assists counties in finding and sharing innovative solutions through education and research, and provides value-added services to save counties and taxpayers money. 
National Association of Regional Councils
The National Association of Regional Councils (NARC) serves as the national voice for regionalism by advocating for regional cooperation as the most effective way to address a variety of community planning and development opportunities and issues. NARC’s member organizations are composed of multiple local governments that work together to serve American communities - large and small, urban and rural.  NARC's membership includes regional councils (RCs), region-wide associations of local governments -- councils of government (COGs), regional planning and development agencies, and metropolitan planning organizations (MPOs).
National Committee on Uniform Traffic Control Devices
The National Committee on Uniform Traffic Control Devices (NCUTCD) is an organization whose purpose is to assist in the development of standards, guides and warrants for traffic control devices and practices used to regulate, warn and guide traffic on streets and highways.  The NCUTCD recommends to the Federal Highway Administration (FHWA) and to other appropriate agencies proposed revisions and interpretations to the Manual on Uniform Traffic Control Devices (MUTCD) and other accepted national standards.  NCUTCD develops public and professional awareness of the principles of safe traffic control devices and practices and provides a forum for qualified individuals with diverse backgrounds and viewpoints to exchange professional information.

National Complete Streets Coalition
The National Complete Streets Coalition is a coalition of corporate and municipal partners that seeks to fundamentally transform the look, feel, and function of the roads and streets in communities, by changing the way most roads are planned, designed, and constructed.  The coalition promotes federal and local policies that support complete streets which are designed and operated to enable safe access for all users.
National Homeland Security Consortium
The National Homeland Security Consortium is a forum for public and private sector disciplines to coalesce efforts and perspectives about how best to protect America in the 21st century. The consortium consists of 21 national organizations that represent local, state, and private professionals. The consortium represents the array of professions that deliver the daily services vital to the safety and security of the United States. The consortium represents the first and secondary responders as well as those who will provide the sustained effort necessary to respond to any major emergency, including leadership and direction by elected and appointed officials. 
National League of Cities (NLC)
The National League of Cities (NLC) is dedicated to helping city leaders build better communities.  Working in partnership with the 49 state municipal leagues, NLC serves as a resource to and an advocate for the more than 19,000 cities, villages and towns it represents.  More than 1,600 municipalities of all sizes pay dues directly to NLC and actively participate as leaders and voting members in the organization.
National Transportation Operations Coalition (NTOC)
The National Transportation Operations Coalition (NTOC) is an alliance of national associations, practitioners, and private sector groups representing the collective interests of stakeholders at state, local, and regional levels seeking to improve management and operation of the nation's existing transportation system so that its performance will exceed customer expectations.
Sustainable Urban Forest Coalition (SUFC)
The Sustainable Urban Forest Coalition (SUFC) is an assembly of national organizations working to advance a unified urban forest agenda for the nation's communities.The SUFC is composed of city planners, educators, landscape architects, non-profit leaders, scientists, arborists, foresters, nurserymen and women, and many other professionals who care for, monitor and advocate for trees and urban forests as a whole.